If it's a Dometic fridge, the recall can be seen by the presence of additional sheet metal shrouding around the burner tube assembly. If you need to unscrew a panel to get at the gas solenoid (and its little shut-off valve), the recall work has been done.
If it's a Norcold fridge, I don't know the details of how to check. (I only have one fridge, a Dometic, in my RV.)
In any case, you can phone the appropriate company armed with the model/serial or VIN number, as appropriate, and have them look the information up.